Base Ten Blocks: Physical representations of extended place value (units, tens, hundreds, thousands)
Place Value: The value of a digit based on its position in a number (up to hundred thousands)
Regrouping: Changing the grouping of numbers without changing their value (carrying and borrowing)
Worksheets: Structured practice sheets for skill development
Expanded Form: Breaking numbers into place values (e.g., 3,456 = 3,000 + 400 + 50 + 6)
Standard Form: Writing numbers with digits (e.g., 3,456)
Unit: Single cube (1) | Ten: Rod (10) | Hundred: Flat (100) | Thousand: Cube (1,000)
- Read: Carefully read the instructions for each problem
- Identify: Determine the place value being addressed
- Model: Use base ten blocks to represent the problem if needed
- Solve: Perform the required operation with attention to place value
- Check: Verify your answer makes sense in context
- Record: Write your answer in the correct format
4,327 = 4 thousands + 3 hundreds + 2 tens + 7 units
Thousands: 4 | Hundreds: 3 | Tens: 2 | Units: 7
4,327 = 4,000 + 300 + 20 + 7
4,327 = 4,000 + 300 + 20 + 7 (expanded form)
• Place value: Each position has a specific value
• Expanded form: Break number into place values
• Base ten blocks: Each digit represents a specific number of blocks
2,456 = 2 thousands + 4 hundreds + 5 tens + 6 units | 3,789 = 3 thousands + 7 hundreds + 8 tens + 9 units
Units: 6 + 9 = 15 units | Tens: 5 + 8 = 13 tens | Hundreds: 4 + 7 = 11 hundreds | Thousands: 2 + 3 = 5 thousands
15 units = 1 ten + 5 units
New totals: Units: 5 | Tens: 13 + 1 = 14 tens | Hundreds: 11 | Thousands: 5
14 tens = 1 hundred + 4 tens
New totals: Units: 5 | Tens: 4 | Hundreds: 11 + 1 = 12 hundreds | Thousands: 5
12 hundreds = 1 thousand + 2 hundreds
New totals: Units: 5 | Tens: 4 | Hundreds: 2 | Thousands: 5 + 1 = 6 thousands
2,456 + 3,789 = 6,245
• Regrouping: 10 of any place value = 1 of the next higher place value
• Addition: Combine like place values
• Place value: Keep track of each place value separately
5,002 = 5 thousands + 0 hundreds + 0 tens + 2 units | 1,847 = 1 thousand + 8 hundreds + 4 tens + 7 units
We have 2 units but need to subtract 7 units → Not enough!
We must regroup from hundreds, but there are 0 hundreds
We must regroup from thousands: 5 thousands = 4 thousands + 10 hundreds
10 hundreds = 9 hundreds + 10 tens
Now we have: 4 thousands + 9 hundreds + 10 tens + 2 units
10 tens = 9 tens + 10 units
Now we have: 4 thousands + 9 hundreds + 9 tens + 12 units
Units: 12 - 7 = 5 | Tens: 9 - 4 = 5 | Hundreds: 9 - 8 = 1 | Thousands: 4 - 1 = 3
5,002 - 1,847 = 3,155
• Borrowing across zeros: When there are zeros, regroup from the next non-zero place
• Subtraction: Take away from like place values
• Regrouping: Break apart higher place value when needed
Extended Place Value: Understanding place value up to hundred thousands and beyond.
- Base Ten Blocks: Physical tools: Units (1), Tens (10), Hundreds (100), Thousands (1,000)
- Place Value: The value of a digit based on its position in a number
- Regrouping: Trading 10 of one place value for 1 of the next higher place value
- Standard Form: Writing numbers with digits (e.g., 23,456)
- Expanded Form: Breaking numbers into place values (e.g., 20,000 + 3,000 + 400 + 50 + 6)
- Word Form: Writing numbers with words (e.g., twenty-three thousand four hundred fifty-six)
- Each place value is 10 times the value of the place to its right
- Only keep up to 9 blocks in each place value position
- 10 units = 1 ten
- 10 tens = 1 hundred
- 10 hundreds = 1 thousand
- 10 thousands = 1 ten-thousand
- Always start regrouping from the rightmost place value
- Read: Carefully read the worksheet instructions
- Identify: Determine what operation or task is required
- Model: Use base ten blocks to represent the problem if needed
- Calculate: Perform the required mathematical operation
- Regroup: Exchange blocks as necessary
- Record: Write the answer in the required format
Simple: Count blocks: 2 hundreds + 5 tens + 3 units = 253
Intermediate: Add: 1,245 + 3,789 = 5,034 (with regrouping)
Advanced: Subtract: 5,002 - 1,847 = 3,155 (borrowing across zeros)
- Circle groups of 10 when counting to make regrouping easier
- Use expanded form to understand the value of each digit
- Always double-check your regrouping in multi-digit operations
- Work systematically from highest to lowest place value
- When subtracting across zeros, break apart the next non-zero place value
- Forgetting to regroup when you have 10 or more blocks in a place value
- Misunderstanding how to borrow across zeros
- Not keeping track of which place value you're working with
- Incorrectly placing commas in large numbers
"Ten of these become one of those": Remember that 10 of any place value become 1 of the next higher place value.
"Right to left": Always start regrouping from the rightmost place value and move left.
Problem 1: Write 8,642 in expanded form and word form.
Problem 2: Add using base ten blocks: 4,728 + 3,596 = ?
Problem 3: Subtract using base ten blocks: 7,003 - 2,847 = ?
- Read: Read each problem carefully
- Plan: Decide which operation to use
- Model: Use base ten blocks to represent the problem
- Calculate: Perform the operation
- Check: Verify your answer makes sense
- Record: Write your answer in the space provided